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First Post: Im looking at a used 2010 and am wondering what the market value is?

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The car will do active cooling when parked in the sun on a very hot day. It will run the AC to keep the pack under some upper limit even when not plugged in.

Up until the point when the pack computer has to make a choice...
Is it better to drain the last bit of pack energy to keep the cells cool, or better to leave some charge and let them get warmer than optimal?

Best to leave it plugged in if the car is parked for extended periods in extreme temps.
 
For what it's worth, warranty is voided by (quoting from the signing paperwork):
exposing an unplugged vehicle to ambient temperatures above 120F for over 24 hours
Storing an unplugged vehicle in temperatures below -40F for over seven days
Leaving your vehicle unplugged where it discharges the battery to at or near zero SOC
 
The car will do active cooling when parked in the sun on a very hot day. It will run the AC to keep the pack under some upper limit even when not plugged in.

Yes. When the car is off, I believe the AC will cool the battery when it gets to 40*C. When the car is on in standard mode, it will start to cool the battery when it gets above 30*C